EP 2814150 A3 20150318 - Methods and apparatus for active front end filter capacitor degradation detection
Title (en)
Methods and apparatus for active front end filter capacitor degradation detection
Title (de)
Verfahren und Vorrichtung für aktive Frontfilterkondensatorverschlechterungserkennung
Title (fr)
Procédés et appareil pour détecter la dégradation active d'un condensateur de filtre d'extrémité avant
Publication
Application
Priority
US 201313872177 A 20130429
Abstract (en)
[origin: US2014320056A1] Apparatus and methods are provided for detecting degradation of delta-connected filter capacitors in an active front end (AFE) power converter, in which delta circuit capacitor leg currents are calculated based on measured branch circuit currents, and filter capacitor impedance values are computed based on the calculated leg currents as well as measured line-to-line voltages and corresponding phase angles for comparison with one or more thresholds to selectively detect degradation of the filter capacitors. Further apparatus and methods are provided for detecting degradation of Y-connected filter capacitors by computation of fundamental frequency RMS impedance values as ratios of RMS capacitor voltages and RMS circuit branch currents, and comparison of the calculated RMS impedance values with one or more thresholds.
IPC 8 full level
H02M 1/00 (2007.01)
CPC (source: EP US)
H02M 1/126 (2013.01 - EP US); H02M 1/32 (2013.01 - EP US); H02M 7/797 (2013.01 - US); H02P 27/06 (2013.01 - US); G01R 31/42 (2013.01 - EP US); G01R 31/64 (2020.01 - EP US); H02M 5/4585 (2013.01 - EP US); H02M 7/219 (2013.01 - EP US)
Citation (search report)
- [XP] EP 2660962 A2 20131106 - ROCKWELL AUTOMATION TECH INC [US]
- [XP] US 2013286692 A1 20131031 - PATEL YOGESH POPATLAL [US], et al
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
US 2014320056 A1 20141030; US 9318944 B2 20160419; BR 102014009978 A2 20151117; CN 104124876 A 20141029; CN 104124876 B 20170510; EP 2814150 A2 20141217; EP 2814150 A3 20150318; EP 2814150 B1 20200311
DOCDB simple family (application)
US 201313872177 A 20130429; BR 102014009978 A 20140425; CN 201410177608 A 20140429; EP 14166343 A 20140429